<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script src="../js/vue.js"></script>
    <div id ="app">
        <button v-on:click.once="clickBtn">只触发一次</button>
    </div>
    <script>
        var vm = new Vue({
            el:"#app",
            data:{},
            methods:{
                clickBtn:function(){
                    console.log('按钮被点击');
                }
            }
        })
    </script>
</body>
</html>